scholarly journals Synthesis, Cr(VI) removal performance and mechanism of nanoscale zero-valent iron modified potassium-doped graphitic carbon nitride

2020 ◽  
Vol 81 (9) ◽  
pp. 1840-1851 ◽  
Author(s):  
Jing Guo ◽  
Tao Chen ◽  
Xiaohui Zhou ◽  
Wenning Xia ◽  
Tao Zheng ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Zero Valent Iron ◽  
Graphitic Carbon Nitride ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Chromium Vi ◽  
Nanoscale Zero Valent Iron ◽  
Metal Treatment ◽  
Terminal Amino

Abstract A novel composite (nZVI@K-GCN) was firstly synthesized by liquid phase reducing nanoscale zero-valent iron (nZVI) on potassium-doped graphitic carbon nitride (K-GCN). The results of Fourier transform infrared (FTIR) spectrometry, X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunauer–Emmett–Teller (BET) suggested that nZVI@K-GCN possessed abundant active functional groups such as terminal amino-groups (-NH or -NH2 groups) and -OH, and the specific surface area and pore volume from BET of nZVI@K-GCN were 4.7 times and 3.7 times higher than that of graphitic carbon nitride (GCN), respectively. These properties showed that the composite was especially suitable for heavy metal treatment. The application of the composite in the removal of chromium(VI) from aqueous solution showed that the maximum adsorption capacity of nZVI@K-GCN towards Cr(VI) was 68.6 mg/g at 308 K when the initial concentration of Cr(VI) was 30 mg/L, and more than 99% removal was obtained at pH = 3. This adsorption was an endothermic and spontaneous process. XPS patterns and batch experiments proved that complexation, electrostatic attraction and reduction precipitation were the main adsorption mechanism for Cr(VI) on nZVI@K-GCN.

scholarly journals Zirconia nanoparticle-modified graphitic carbon nitride nanosheets for effective photocatalytic degradation of 4-nitrophenol in water

2019 ◽  
Vol 9 (8) ◽  
Author(s):  
Mohanna Zarei ◽  
Jamil Bahrami ◽  
Mohammad Zarei
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Carbon Nitride ◽  
Diffuse Reflectance Spectroscopy ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zirconia Nanoparticle ◽  
Carbon Nitride Nanosheets

Abstract Zirconia (ZrO2)-modified graphitic carbon nitride (g-C3N4) nanocomposite was used for effective photodegradation of 4-nitrophenol (4-NP) in water. The ZrO2 nanoparticles, g-C3N4 nanosheets, and ZrO2/g-C3N4 nanocomposite were well characterized by including N2 adsorption, X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, UV–Vis diffuse reflectance spectroscopy, photoelectrochemical measurements, and photoluminescence spectroscopy methods. ZrO2/g-C3N4 nanocomposites were formed at room temperature using sonication and used for effective for photodegradation of 4-NP under irradiation with visible light. The nanocomposite samples resulted in a significant increase in photocatalytic activity compared with single-component samples of g-C3N4. In particular, the ZrO2/g-C3N4 nanocomposite exhibited the significant increase in the photocatalytic activity. The ZrO2/g-C3N4 nanocomposite showed an excellent catalytic activity toward the reduction of 4-NP in aqueous medium. Further, ZrO2/g-C3N4 nanocomposite can be reused several times for photocatalytic degradation as well as for 4-NP adsorption.

AgCl Loaded Mesoporous Graphitic Carbon Nitride as Visible Light Photocatalyst

2012 ◽  
Vol 518-523 ◽  
pp. 54-58 ◽  
Author(s):  
Chen Zhao ◽  
Si Yuan Yang ◽  
Zuo Tao Liu ◽  
Yue Ping Fang
Keyword(s):  
Carbon Nitride ◽  
Silver Chloride ◽  
Dip Coating ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
The Novel ◽  
X Ray Diffraction ◽  
Visible Light Photocatalyst ◽  
Transmission Electron ◽  
Uv Visible

A novel photocatalyst, AgCl loaded mesoporous graphitic carbon nitride (mpg-C3N4) in which silver chloride nanoparticles were introduced into the mesopores carbon nitride, was prepared by a dip-coating procedure. The as-prepared photocatalyst was characterized by X-ray diffraction, transmission electron microscopy, UV-visible spectrophotometry. The novel photocatalyst manifested a better photocatalytic activity than that of pure mpg-C3N4 for degradation of methyl orange.

scholarly journals Graphitic carbon nitride prepared from urea as a photocatalyst for visible-light carbon dioxide reduction with the aid of a mononuclear ruthenium(II) complex

2018 ◽  
Vol 14 ◽  
pp. 1806-1812 ◽  
Author(s):  
Kazuhiko Maeda ◽  
Daehyeon An ◽  
Ryo Kuriki ◽  
Daling Lu ◽  
Osamu Ishitani
Keyword(s):  
Visible Light ◽  
Carbon Nitride ◽  
Synthesis Temperature ◽  
Maximum Activity ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
X Ray Diffraction ◽  
Reduction Activity ◽  
Photocatalytic Activities ◽  
Different Temperatures

Graphitic carbon nitride (g-C3N4) was synthesized by heating urea at different temperatures (773–923 K) in air, and was examined as a photocatalyst for CO2 reduction. With increasing synthesis temperature, the conversion of urea into g-C3N4 was facilitated, as confirmed by X-ray diffraction, FTIR spectroscopy and elemental analysis. The as-synthesized g-C3N4 samples, further modified with Ag nanoparticles, were capable of reducing CO2 into formate under visible light (λ > 400 nm) in the presence of triethanolamine as an electron donor, with the aid of a molecular Ru(II) cocatalyst (RuP). The CO2 reduction activity was improved by increasing the synthesis temperature of g-C3N4, with the maximum activity obtained at 873–923 K. This trend was also consistent with that observed in photocatalytic H2 evolution using Pt-loaded g-C3N4. The photocatalytic activities of RuP/g-C3N4 for CO2 reduction and H2 evolution were thus shown to be strongly associated with the generation of the crystallized g-C3N4 phase.

scholarly journals Development of ciprofloxacin sensor using iron-doped graphitic carbon nitride as transducer matrix: Analysis of ciprofloxacin in blood samples

2021 ◽  
Author(s):  
Hattna Shivarudraiah Vedhavathi ◽  
Ballur Prasanna Sanjay ◽  
Mahesh Basavaraju ◽  
Beejaganahalli Sangameshwara Madhukar ◽  
Ningappa Kumara Swamy
Keyword(s):  
Carbon Nitride ◽  
Electrochemical Impedance ◽  
Graphitic Carbon ◽  
Electrochemical Sensing ◽  
Graphitic Carbon Nitride ◽  
Matrix Analysis ◽  
Pencil Graphite Electrode ◽  
X Ray Diffraction ◽  
Standard Samples ◽  
X Ray

In the present work, we have synthesized an iron-decorated graphitic carbon nitride (Fe@g-C3N4) composite and employed it for electrochemical sensing of ciprofloxacin (CFX). The physicochemical characteristics of the Fe@g-C3N4 composite were analyzed with X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray diffraction (EDX) spectroscopy methods. Further, the pencil graphite electrode (PGE) was modified with Fe@g-C3N4 composite to get PGE/Fe@g-C3N4 electrode and characterized the resultant electrode by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Differential pulse voltammetry (DPV) was employed to determine the effect of concentration and interferents. The modified PGE/Fe@g-C3N4 electrode demonstrated the exceptional electrochemical performance for CFX identification and quantification with a LOD of 5.4 nM, a wide linear range of 0.001-1.0 µM, and high sensitivity of 0.0018 µA mM-1 cm-2. Besides, Fe@g-C3N4 modified PGE showed remarkable recovery results in qualitative analysis of CFX in human blood specimens. This research advocates that the Fe@g-C3N4 composite acts as an excellent transducer material in the electrochemical sensing of CFX in blood and standard samples. Further, the proposed strategy deduces that the PGE/Fe@g-C3N4 sensor can be a prospective candidate for the dynamic determination of CFX in blood serum and possibly ratified as an exceptional drug sensor for therapeutic purposes.

scholarly journals Fabrication of Covalently Linked Ruthenium Complex Onto Carbon Nitride Nanotubes For The Photocatalytic Degradation of Tetracycline Antibiotic

2021 ◽  
Author(s):  
Mohaddeseh Shahabi Nejad ◽  
Zahra Vakily ◽  
Ali Mostafavi ◽  
Hassan Sheibani
Keyword(s):  
Carbon Nitride ◽  
Ruthenium Complex ◽  
Irradiation Time ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Effective Parameters ◽  
X Ray Diffraction ◽  
Ru Complex ◽  
Transmission Electron ◽  
Covalently Linked

Abstract Due to the problem of direct disposal of effluents contains antibiotics to the environment and the emergence of resistant bacterial pathogens, the wastewater treatment of pharmaceutical industry has known as an importance research background. In this study, the refinement and photodegradation ability of one of the most widely used antibiotics, “tetracycline” was investigated by ruthenium complex immobilized on the modified graphitic carbon nitride nanotubes. For this purpose, graphitic carbon nitride nanotubes (g-C3N4 NTs) were successfully synthesized by the hydrothermal method and functionalized with 1,10-Phenantroline-5,6-dione ligand during another step. Then, the functionalized g-C3N4 NTs were reinforced with immobilization of dichloro(p-cymene)ruthenium(II) dimer. The structure and morphology of the prepared photocatalyst was studied by X-ray diffraction (XRD), fourier transform infrared (FT-IR), scanning, and transmission electron microscopy (SEM & TEM) analyses. In the following, the photocatalyst's ability to optically degrade the tetracycline antibiotics was performed in a suspension reactor equipped with a LED lamp (60 W) and effective parameters such as the amount of catalyst, irradiation time, temperature, and pH were optimized. The results showed that the immobilization of Ru complex onto functionalized g-C3N4 NTs improved the photocatalytic activity and increased the degradation efficiencies to amount 43%. Furthermore, COD analysis was used for the determination of the amount of mineralization and results showed that the mineralization of 10 mg/L tetracycline solution of about 90% can be performed using 20 mg of Ru (II) complex/ g-C3N4 NTs at pH=7 after 480 min without any additive oxidant.

Synthesis and characterization of a multi-functional on–off–on fluorescent oxidized graphitic carbon nitride nanosensor for iodide, chromium(vi), and ascorbic acid

2019 ◽  
Vol 7 (38) ◽  
pp. 11896-11902 ◽  
Author(s):  
Jun-Ling Yu ◽  
Lu-Yuan Hao ◽  
Bin-Bin Dong ◽  
Fei-Hong Wang ◽  
Sayed Ali Khan ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Selective Recognition ◽  
Synthesis And Characterization ◽  
Enhanced Fluorescence ◽  
Chromium Vi

The nano-CNO with enhanced fluorescence exhibited sensitive and selective recognition of iodides, chromium(vi), which is promising for biosensing.

scholarly journals Preparation of MnO2 modified magnetic graphitic carbon nitride composite and its adsorption toward Pb(II) in waste water

2021 ◽  
Author(s):  
Wenning Xia ◽  
Yaochi Liu
Keyword(s):  
Carbon Nitride ◽  
Ph Value ◽  
Chemical Properties ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Maximum Adsorption Capacity ◽  
Hydroxyl Groups ◽  
In Situ Deposition ◽  
Physical And Chemical ◽  
Kinetics And Isotherms

Abstract Based on graphitic carbon nitride (CN) nanosheets, a novel MnO2 modified magnetic graphitic carbon nitride composite (MMCN) was prepared via magnetization and in-situ deposition of MnO2. Then an array of characterizations and experiments were conducted to explore the physical and chemical properties of the synthesized MMCN material. The adsorption behavior and removal mechanism of the MMCN were also discussed intensively. The best pH value of Pb(II) of MMCN was 6. The maximum adsorption capacity of MMCN was as high as 187.6 mg/g, which was much higher than that of MCN and original CN, and removal percentage of Pb(II) was about 99%. The adsorption kinetics and isotherms were in accorded with pseudo-second-order model and Langmuir model, respectively. The chemical adsorption of Pb(II) indicated that MMCN was a successful modified sorbent and pretty efficient to remove Pb(II) in aqueous owing to the complexation and ion exchange of ample amino and hydroxyl groups. Moreover, MMCN could be separated easily from aqueous under an external field after reaction with its magnetic performance.

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